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2. P. Erd'́os, A. Hajnal and E.C. Milner, Set mappings and polarized partition relations, in: Proc. Colloq. on Combinatorial Theory and its Applications, Balatonfured, Hungary 1969 (North- Holland, Amsterdam/ Akad. Kiado, Budapest, 1970) 326-363.
3. An independence result for pinning for ordinals;Larson;J. London Math. Soc.,1979
4. J. Larson, Martin's axiom and ordinal graphs: large independent sets or infinite paths, Ann. Pure Appl. Logic, in this issue.